JP2015200793A - Stereoscopic image display device and stereoscopic image display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stereoscopic image display device and a stereoscopic image display method capable of forming a real image of an object in the front view of a device.SOLUTION: A stereoscopic image device includes three reflection surfaces 17 to 19 mutually crossed at a right-angle, arranges a plurality of cubic corner bodies 12 provided with a light inlet 11a on a top part side of the three reflection surfaces 17 to 19 in a plane manner with a shaft center of the cubic corner body 12 in parallel to each other, and uses a stereoscopic image display device 10 arranged with a half mirror 14 on a light outlet surface of the cubic corner body 12. The stereoscopic image device inputs light from an object 26 from a light inlet port 11a to the cubic corner body 12 so as to be reflected again by the cubic corner body 12 and allowed to pass though the half mirror 14 to form an image.

Description

The present invention relates to a stereoscopic image display device and a stereoscopic image display method using a corner cube (hereinafter referred to as a cubic corner body) having three surfaces of a legislative body.

Conventionally, as an apparatus and method for displaying a stereoscopic image, a stereoscopic image display apparatus described in Patent Document 1 and an optical imaging apparatus and method described in Patent Document 2 are known. In the technique described in Patent Document 1, a large number of cubic mirrors are arranged in a lattice pattern, light reflected by one surface of each cubic mirror is reflected by an orthogonal surface of the cubic mirror, and a stereoscopic image is formed as a real image on the opposite surface of the display device. Is formed.

Further, as shown in FIG. 5, the optical imaging device (stereoscopic image display device) 60 described in Patent Document 2 includes first and first belt-shaped planar reflection portions 63 and 64 that are orthogonal to the front and back surfaces. The two light control members 65 and 66 are arranged so that the plane reflecting portions 63 and 64 are orthogonal to each other, and a stereoscopic image 67 arranged on one side of the front and back surfaces is formed as a real image 68 on the other side. It was.

JP 2009-300623 A WO2009 / 131128 publication

However, in the optical imaging device 60 described in Patent Document 2 (the same applies to the display device described in Patent Document 1), the stereoscopic image 67 is arranged obliquely with respect to the front and back surfaces, and light from the stereoscopic image 67 is entered. Since the basic principle is to form a real image 68 corresponding to the stereoscopic image 67 in an oblique direction from the front and back surfaces, it is difficult to form a real image of a stereoscopic image on the front (opposite surface) of the front and back surfaces of the optical imaging device 60. There was a problem of being.
Of course, it is possible to change the imaging position by placing a mirror or the like, but there is a problem that the structure becomes complicated and the apparatus itself has a relatively large thickness.

The present invention has been made in view of such circumstances, and an object thereof is to provide a stereoscopic image display apparatus and a stereoscopic image display method capable of forming a real image of an object when the apparatus is viewed from the front.

The stereoscopic image display device according to the first invention that meets the above object has three reflective surfaces that intersect at right angles to each other, and a cubic corner body provided with a light entrance on the top side of the three reflective surfaces has its axis. A large number of mirrors are arranged side by side in parallel, and a half mirror is provided on the base side.

In the stereoscopic image display device according to the first aspect of the present invention, it is preferable that the light entrance is formed to be removed from a virtual vertex of the cubic corner body to a certain height position.

In the stereoscopic image display device according to the first aspect of the present invention, when the height of the cubic corner body with respect to the virtual vertex of the cubic corner body is h, the light entrance is from the virtual vertex (0.3 to 0.8) It is preferably formed at a position in the height range of h.

In the stereoscopic image display device according to the first aspect of the present invention, it is preferable that the cubic corner body is made of transparent plastic or glass, and the three reflecting surfaces are mirror-finished.

In the stereoscopic image display method according to the second invention, a cubic corner body having three reflecting surfaces intersecting at right angles to each other and having a light entrance provided on the top side of the three reflecting surfaces is defined as the cubic corner body. Using a stereoscopic image display device in which a plurality of planes are arranged in parallel with the axis of the body in parallel and a half mirror is arranged on the light exit surface of the cubic corner body, light from the object is incident on the cubic corner body from the light entrance. And is retroreflected by the half mirror and the cubic corner body, and passes through the half mirror to emit light to form an image.

In the stereoscopic image display device and the stereoscopic image display method according to the present invention, light from an object (including a subject and a light source, for example) is taken from a light entrance, reflected by a half mirror, and reflected by a cubic corner body. Since the image is formed through the half mirror, an object (for example, a stereoscopic image) placed at a vertical position on one side with respect to the stereoscopic image display device is a real image at a vertical position on the other side of the stereoscopic image display device. Can be formed.
Therefore, it is possible to appreciate the real image of the object when the stereoscopic image display device is viewed from the front, and the entire device can be thinned.

In particular, in the present invention, an object (including a virtual image by an electric signal or the like) arranged on the back side of the stereoscopic image display device can be imaged on the surface side of the stereoscopic image display device. Easy to use for other displays.

(A) is sectional drawing of the three-dimensional image display apparatus which concerns on one embodiment of this invention, (B) is the bottom view. (A) is a side view showing the principle of the stereoscopic image display device, and (B) is a bottom view of the same. It is a perspective view which shows the formation method of the same three-dimensional image display apparatus. It is operation | movement explanatory drawing of the three-dimensional image display apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the three-dimensional image display apparatus which concerns on a prior art example.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIGS. 1A, 1B, and 2A, a stereoscopic image display apparatus 10 according to an embodiment of the present invention has a large number of light entrances 11a formed by lacking the top 11. The cubic corner bodies 12 of the light control member (cubic corner aggregate) 13 are arranged adjacent to each other without a gap, and the half mirror 14 is provided on the light output side (base side) of the light control member 13. . The cubic corner body 12 is called a corner cube, and is generally used as a retroreflecting material. Further, the light entrance 11a has a structure (for example, a horizontal plane) in which light enters the cubic corner body 12.

The cubic corner body 12 is mainly a transparent body made of glass or plastic, and has three orthogonal surfaces (reflective surfaces) 17 to 19 of the cube 16 as shown in FIGS. 2 (A), (B), and FIG. doing. In the three surfaces 17 to 19, the apex 11 of the right-angled isosceles triangle is horizontally cut from the virtual apex (vertical angle B) at a certain height h1 (FIG. 2A). As a result, the cubic corner body 12 includes three surfaces 17 to 19 each having an isosceles trapezoid shape, an equilateral triangle 23 surrounded by bases (or ceiling sides) 20 to 22 of the three surfaces 17 to 19, and a top plane 24. Have.

In FIG. 3, the virtual vertex of the cube 16 will be described as A to H, respectively. When the length of one edge (side) of the cube 16 is a and the midpoint of AE is Q, AQ = a / √2, QC = a · √ (3/2), QB = a / √2, cos θ = QB / QC = 1 / √3. Therefore, when the center line m is arranged vertically with the apex angle B of the cubic corner body 12 as a reference, the inclination θ of each of the surfaces 17 to 19 with respect to the horizontal plane N is arccos (1 / √3) ≈54.736 degrees. Become.

Since the cubic corner body 12 is an equilateral triangle in plan view when the center line m is vertical, as shown in FIG. 1B, the cubic corner bodies 12 having the same shape are arranged with the axis m parallel. Can be laid flat without gaps. In this case, as shown in FIG. 2A, the cubic corner body 12 removes the top 11 at the position of the height h1, and forms a top plane 24 perpendicular to the center line m. In this embodiment, the top plane 24 becomes the light entrance 11a that passes through the front and back. Moreover, the mirror surface process (not a half mirror) is performed on the outer surfaces 17 to 19 of the cubic corner body 12. Thus, the light control member 13 functions as a retroreflecting material in which incident light and reflected light are at the same angle.

The cut height h1 forming the top plane 24 is 0.3 to 0.8 times the height (BS) h with respect to the apex angle B when the cubic corner body 12 is erected with the center line m vertical. The height is preferably (more preferably 0.35 to 0.5 times). When the height h1 is increased, the reflection area of the cubic corner body 12 is decreased, and when the height h1 is decreased, the reflected light is decreased and the light quantity of the formed real image is insufficient.

In this state, the individual light entrances 11a of the light control member 13 configured by the cubic corner bodies 12 arranged in a large number are equilateral triangles arranged with a gap on the same plane. In this embodiment, the light entrance 11a is formed below the cubic corner body 12 (one side, the light entrance side, the top side).
On the upper side (the other side, the light exit side, the base side) of the cubic corner body 12, a light exit (light exit surface) composed of equilateral triangles 23 is formed, which are in the same plane and in contact with the light exit surface, the half mirror 14. Is formed or arranged.

In this case, the light transmittance of the half mirror 14 is preferably 20 to 80% (more preferably 40 to 70%). As a result, light from the object 26 (including a flat or three-dimensional display image) 26 enters the cubic corner body 12 through the light entrance 11a and the half mirror 14, is retroreflected, passes through the half mirror 14 and is three-dimensional. A real image 27 is formed at a position outside the image display device 10.

Although a half mirror can be formed directly on the light exit side of the cubic corner body 12, a transparent plate material can be arranged on the light exit side of the cubic corner body 12, and a half mirror can be formed on the front or back surface of the transparent plate material. it can.
Further, the light control member 13 in a state in which a large number of cubic corner bodies 12 are arranged is molded, and the connecting member that connects these light emitting surfaces is made transparent, and a half mirror is formed on the surface of the connecting member, The inclined surface of the cubic corner body can be mirror-finished to form a light entrance 11a having translucency on the top plane 24 of an equilateral triangle when viewed from the bottom. The top flat surface 24 may be formed by horizontally cutting and polishing the top of the original cubic corner body whose back side is mirror-finished.

Subsequently, the operation of the stereoscopic image display device 10 will be described, and a stereoscopic image display method according to an embodiment of the present invention will also be described.
As shown in FIGS. 1 and 4, when the object 26 is separated by a certain distance below the stereoscopic image display device 10 having the above configuration, the light from the object 26 passes through the light entrance 11 a. The light passes through, is reflected by the half mirror 14, and enters the light control member 13. Since the light control member 13 itself is a retroreflective material, light (ie, retroreflected light) is reflected by the retroreflective material in the incident direction via the three surfaces 17 to 19, and is reflected on the half mirror 14. It reaches and transmits light. That is, the light L from the object 26 1) passes through the light entrance 11a, 2) is reflected at P4 of the half mirror 14, 3) is reflected at point P3 on the surface 17, and 3) is reflected at point P2 on the surface 18. 4) Reflected at point P1 on the surface 19. The reflected light at the point P1 on the surface 19 passes through the half mirror 14 and forms a real image 27 on the outside (upper side of the stereoscopic image display device 10).

A part of the light entering from the light entrance 11 a is reflected by the half mirror 14, but the other light passes through the half mirror 14. The transmittance of the half mirror 14 is preferably close to 40 to 60%, and the area of the light entrance 11a is preferably 20 to 36% of the area of the equilateral triangle 23. The area of the light entrance 11a is proportional to the square of the height h1.

The present invention is not limited to the above-described embodiment, and the configuration thereof can be changed without changing the gist of the present invention.

In the stereoscopic image display device according to the present invention, the stereoscopic image display device can be viewed from the front, and the real image of the object can be viewed in front of the stereoscopic image display device. In particular, when it is applied to a display of a mobile phone or a personal computer, it is not necessary to tilt the stereoscopic image display device as in the prior art, and convenience is improved.

10: Stereoscopic image display device, 11: Top, 11a: Light entrance, 12: Cubic corner body, 13: Light control member, 14: Half mirror, 16: Cube, 17-19: Plane, 20-22: Bottom, 23: equilateral triangle, 24: top plane, 26: object, 27: real image

Claims (5)

A large number of cubic corner bodies having three reflecting surfaces that intersect each other at right angles and having a light entrance on the top side of the three reflecting surfaces are arranged side by side in parallel, and a half mirror on the base side. A three-dimensional image display device comprising: The stereoscopic image display device according to claim 1, wherein the light entrance is formed by being removed from a virtual vertex of the cubic corner body to a certain height position. 3. The stereoscopic image display device according to claim 1, wherein when the height of the cubic corner body with respect to the virtual vertex of the cubic corner body is set to h, the light entrance is at (0.3) from the virtual vertex. A stereoscopic image display device formed at a position in a height range of .about.0.8) h. The stereoscopic image display device according to any one of claims 1 to 3, wherein the cubic corner body is made of transparent plastic or glass, and the three reflecting surfaces are mirror-finished. Stereoscopic image display device. A plurality of cubic corner bodies having three reflecting surfaces that intersect each other at right angles and having a light entrance provided on the top side of the three reflecting surfaces are arranged in a plane with the axes of the cubic corner bodies parallel to each other, In addition, a stereoscopic image display device in which a half mirror is disposed on the light exit surface of the cubic corner body is used, and light from an object is put into the cubic corner body from the light entrance and retroreflected by the half mirror and the cubic corner body. A three-dimensional image display method, wherein the half-mirror passes through the half mirror and emits light outside to form an image.

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